The Voice Assistant (TalkBack) is a screen reading program that can be activated to assist blind and visually impaired people. After activation, each entry on the Samsung device is provided with a spoken feedback. This describes what is touched, selected or activated.

Voice Assistant also changes the operation a little bit. One tap selects (blue border) the respective element and is read aloud. A double tap executes the action.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Accessibility
Step 3:  Tap on  Screen reader
Step 4:  Enable  Voice Assistant
Step 5:  Confirm with  Allow
  1. Open the Settings
  2. Tap on Accessibility
  3. Tap on Screen reader
  4. Enable Voice Assistant
  5. Confirm with Allow

Samsung Instructions